【目的】永磁屏蔽电机(PMCM)凭借其独特的优势被广泛地应用于石油、化工以及核工业等领域。然而，PMCM在运行过程中，存在较大的屏蔽套损耗，导致其整体效率较低，这在很大程度上限制了其进一步的推广与应用，阻碍了相关产业的技术进步和设备升级。针对上述问题，本文提出了一种创新性的正弦气隙磁密设计方法。【方法】通过深入研究和理论分析，利用该方法对一台额定功率为 1.5 kW的PMCM的永磁体参数进行了细致且全面的优化设计，并确定了最优的永磁体尺寸参数。同时，本文还运用有限元法对优化前后的PMCM性能进行了系统而详细的比较分析。【结果】研究结果表明，该设计方法能够有效地降低气隙磁密中的谐波含量，极大地提升了电机的运行性能。优化后的电机损耗降低了30.44%，效率提高了8.87%；电机最高温度降低了8.36%。【结论】该研究为PMCM的广泛应用提供了理论支撑，将助力高效可靠电机设备的发展，创造显著的经济和社会效益。

[Objective] Permanent magnet canned motor (PMCM) are widely used in petroleum, chemical, and nuclear industries due to their unique advantages. However, during operation, PMCM exhibit significant can losses, resulting in relatively low overall efficiency. This limitation substantially restricts their broader adoption and application, hindering technological progress and equipment upgrades in related industries. To address these challenges, this paper proposes an innovative sinusoidal air-gap magnetic flux density design method. [Methods] Through in-depth research and theoretical analysis, this study conducted a comprehensive optimization design of the permanent magnet parameters for a 1.5 kW PMCM using the proposed method, determining the optimal magnet dimensions. Additionally, finite element analysis was systematically employed to compare and analyze the performance of the PMCM before and after optimization. [Results] The research results demonstrated that the proposed design method can effectively reduce harmonic content in the air-gap magnetic flux density, significantly improving motor performance. After optimization, the motor losses were reduced by 30.44%, efficiency was increased by 8.87%, and the maximum operating temperature was lowered by 8.36%. [Conclusion] This research provides theoretical support for the widespread application of PMCM, facilitating the development of efficient and reliable motor equipment, thereby creating significant economic and social benefits.

辽宁省教育厅一般项目(LJ212410167024);国家自然科学基金(62473061)